Stapling machine



March 3, 1936.

W. F. WEBER STAPLING MACHINE Fild Jan. 22, 1930 2 Sheets-Sheet l 40 JEJE@ I fide/7W.'

F Weber,

March 3, 1936. w F. WEBER STAPLING MACHINE Filed Jan. 22, 1930 2 Sheets-Sheet 2 Q l M* @6.

Patented Mar. 3, 1936 UNITED g STATES STAPLING MACHINE William F. Weber, Chicago, Ill., assigner toAce Fastener Corporation, Chicago, Ill., a corporation of Illinois applicationeJanuary 22, 1930, Serial No. 422,500

55 Claims.

This invention has to do with stapling machines, and is particularly concerned with small hand-operated stapling machines of the so-called desk type, which are used in fastening together two or more thicknesses of paper, fabric or other easily perforated material with ine U-shaped wire staples.

The object of the invention is to provide a novel stapling machine of the type described which is inexpensive to manufacture, is light and easy to handle, and will not jam, even when roughly or improperly used.

While the foregoing statement is indicative in a general way of the nature of the invention, other objects and advantages will be evident to those skilled in the art upon a full understanding of the novel construction, arrangement and operation of the-improved stapling machine.

One form of the inventionis presented herein for the purpose of exemplication, but it will of course be appreciated that the invention is susceptible of embodiment in other structurally modied forms coming equally within the scope of the appended claims.

In the accompanying drawings:

F.g. 1 is a side view of a stapling machine constructed in accordance with the invention;

Fig. 2 is a partially sectioned plan view of the head of the machine, taken on the line 2--2 of Fig. 4;

' As will be observed in Fig. 1, the machine consists of a base I0 and an arm Il. The base is provided at its front end with a staple-clinching anvil I2 of any desired construction, and the arm, which is pivoted to the base at I3, is provided-atits front with a staple-driving plunger I4, which plunger is located directly above the anvil.

'I'he staples I5 which are used in the machine are U-shaped, and straddle the upper portion of a. core bar I6 between two inwardly flanged side plates Il, which bar and plates together constitute the arm II. f The core bar' I6 is wider at its lower portion than at the top where the staples are ca ried. Shoulders are thus formed on either side which shoulders, when the side plates are attached thereto, form the clearance space for the staple legs. The core bar I6 is of, a solid material construction, the front and rear ends being of full cross-section, the middle section being cut out at its bottom to remove 5 weight. At the time that the staples are manufactured they are preferably cemented together in way as the staples and is detachably connected to a finger piece I9 on the free end of a tensioned coil spring 20.` The end of the spring and the finger piece carried thereby move longitudinally 20 within the slot which is present above the bar I6 between the nturned upper edges 2| of the plates I'I.

The plunger I4 is-composed of a tube 22 of rectangular cross-section and a driving blade 23 25 which is attached. to the front face of the tube and projects downwardly a substantial distance below the lower end of the latter. The tube is .topped by a curved striking plate 24 and forms a housing for a return springl 25 whichis com- 30 pressed between the striking plate and a forwardly bent ange 26 on the bottom of an upright plate 21 at the rear of the plunger. The lower face of the forwardly bent ange 26 rests upon the upper inturned iianges of the side' 35 plates Il and forms a stop plate against which the lower edge of the plunger strikes. The plunger is positioned within the closed front end of a rearwardly opening U-shaped casing 28, which casing embraces the front end of the arm 40 I I and extends upwardly therefrom. The plate 21 is arranged crosswise b'etween `the sides of the casing and forms the rear wall of the guide.-l way in which the plunger I4 reciprocates. The plate 21 is preferably held in place by laterally 45 projecting tongues 29 which nt into apertures 30 in the sides of the casing. The casing 28 is sprung outwardly suiliciently to allow the tongues 29 of the plate 2l toenter into the apertures 30 whereupon the casing returns to its natural par- 50 allel position and thev plate 21 maintains the inside of the casing walls in spaced apart relawith the inside of the front wall of the casingl in 55 the bar I6, whereby to leave therebetween a slot` 32 which is just large enough in cross section to 'accommodate the lower end of the driving blade 23. The slot 32 or staple discharging chute is thus formed by the inner surface of the front wall of the casing 28, the inside front portions of the side plates I1 and the front end of the bar I6. 'I'he staples upon their descent in the slot 32 are supported from rearward displacement by the enlarged shoulder portions of the staple core I6. The slot 32 extends downwardly through the bottom ofthe arm, and the guideway in the' arm for the staples opens at right angles into such slot at a point just below the edge of the blade 23 when the latter is in its uppermost position, wherebyto permit the springpressed follower I8 to project the foremost staple into the path of the blade 23 each time that the plunger I4 carrying the blade 23 is raised into its uppermost position. The casing is closed over by a cover plate 33 which is held in place by screws 34. The ears of'the cover 33 through which the screws pass are formed to closely t the outside faces of the open rear portion of the casing 28 and hold the side platesv of the casing in parallel and spaced. relation.

The spring 20 is positioned with the coiled portion 35 thereof in the rear part of the casing 26. The inner end of the coil is non-rotatably secured to a headed pin 36, and the ends of the pin extend through apertures in the sides of the casing. The head 31 of the pin is squared,and the aperture into which it fits is also squared, whereby to prevent the pin from turning. In order to wind up the spring, it is merely necessary to retract the pin a little and turn it. The coiled portion of the spring is centered in the casing by a U- shaped bracket 33.' The sides 33 of the bracket extend on opposite sides'of the spring in spaced relation to the sides of the casing,- and the cross web 40 of the bracket is rigidly attached to the back of the' partition plate 21'. The sides of the bracket are of course apertured to permit the pin 36 to pass therethrough. a

'I'he plunger I4 carries two vertically elongated plates 4I which are rigidly secured to opposite sidesof the tube 22 by screws 42. Each of the.

plates is provided along its rear edge with a downwardly facing shoulder 43, an upwardly facing shoulder 44 below the shoulder 43, and a finely toothed rack 45 below the shoulder 44. The cas- 1 ing 28 contains two pawls 46 which are pivoted at closely adjacent the sides ofthe casing by a their upper ends on a pin 41 and are maintained spacer sleeve v49 on the pin. The pawls extend downwardly in the spaces between the sides of the casing and the sides of the bracket 36, and

each is provided with a forwardly extending finger 49, a forwardly extending nose 50', and a downwardly extending point 5I, The nger is located at the'topof the pawl, the nose is positioned about half-way down, and the point is situated at the lowermost extremity. The casing also contains two dogs 52 which are pivotedl at their rear ends on studs 53 and are drawn upwardly towardsthe pawls 46 by interconnecting springs 54. The dogs 52 are spaced from the ears 39 and held in parallelism by washers 52a. Each l of the dogs isprovided at its front end with an upwardly extending point 55. 'I'he ngers 49 on thepawls extend through openings 5 6 in the partition plate 21 into the recesses in the plates 4I between the shoulders 43 and 44 for alternate coaction with the latter; the noses 56 on the pawls likewise extend through openings 51 in the plate 21 into engagement'vwith the teeth of the racks When the plunger I4 returns to itsuppermost position after the blade 23 thereon has severed, driven and clinched the foremost staple, the

. shoulders 44 on the plates 4I engage with the fingers 49 and swing the pawls 46 into the position shown in Fig. 4, in which position the points on the dogs 52 are drawn up behind the points 54 on the pawls by the contracting action ofv the springs 54 and the noses 50 of the `pawls are maintained in spring-pressedsengagement with the teeth on the racks 45.

When the plunger is moved downwardly, the teeth on the racks 45 will cam the noses of the pawls 46 rearwardly against the yielding resistance offered by the springs 54. Should the downward movement of the plunger be discontinued for any reason before the plunger has reached its lowermost position, the noses of the pawls will lock with the teeth, as shown in Fig. 5, and will prevent the plunger from moving upwardly again, making it necessary ,for whoeverllatter into the positi'onshown in Fig. 6, in which position the points 55 on the dogs 52 are drawn up in front of the points 5| on the pawls by the action ofthe springs 54 and the noses 56 of the patvls are moved out of engagement with the teeth on the racks 45, permitting the plunger to return to its uppermost position under the expandiiig action of the spring 25.

While only one pawl and only one dog might be used, two of each are preferably employed, and the teeth on the rack which cooperates with one of the pawls are preferably staggered with respect to the teeth on the other rack, whereby to afford a large number of closely spaced positions in which the plunger will be locked against upward movement and at the same time permit of relatively large and consequently strong and durable teeth on the racks. The extending finger 49 of pawl 46 is also used to limit the upward movement of the plunger I4. The plunger in its uppermost position causes the lower edge of the pawl 46 at 50 (Figure 4) to seat againstI the edge of the plate 4| and the nger49 seating against the upper edge of the cut out portion of the plate 21 stopping the plunger I4 in, its raised position. It is not necessary, however, that point 50 limit the movement of the pawl 46 against the plate 4I and that the finger 49 seat against face 56 for either,

. or any onestop, is sufficient to arrest the plunger some distance from the point where the guide--v way for the staples opens into the, downwardly shown in Fig. 1.

extending slot 32 in which the driving blade 23 operates, thus preventing the guideway from being completely 'emptied of staples before another strip of staples is inserted. v

As in other stapling machines of the desk type, the irontiend of the arm il is normally held in slightly 'spaced relation to the anvil l2 'by a spring 58, as shown in Fig. l, which spring is preferably located closely adjacent the pivotal axis I8 o f the arm. The pivotal connection between the base'lll and'therarm Il preferably consists of a pin i3 which passes transversely through the core bar IS and is supported at its ends in apertures formed in-twc upwardly extending ears 5s. The ears 59 preferably compose the side portions of an upwardly opening U-shaped bracket 69. 'I'he cross web 6i of the bracket is riveted or otherwise rigidly secured to the lower surface of the base I angl` the side'portions 59 of the bracket t into and project upwardly through correspondingly shaped slots in the top of the base, all asvclearly The height at which the front endo! the arm Il is held above the anvil I2 by the spring 53 is determined by a set screw 62 which extends down through a threaded aperture in the rea-r end of the arm intocontact with the rear end o'ithe base IU. To vary the height of the arm, it is mereLv necessary to loosen a lock nut B3 on the screw and turnthe latter.

I claim:

1. 'Ihe combination in a staplingmachine, of a base-having a clinching anvil, a pivotally connectedarm having a reciprocable driving plunger,

, means for feeding staples one at a time into the path o! movement of the plunger, and means for preventing the plunger from being returned to its uppermost position until afterit has completed a full downstroke, comprising a rack carried by the plunger, an L-shaped lever having a pawl and carried'by the arm, a spring actuated trigger 'for moving the lever to advance said pawl into spring-pressed engagement with the rack i when: theplunger is in its 'uppermost position, and a lug on said rack engaging said L-shaped lever for disengaging the pawl from the rack as said plunger completes a full downstroke, said trigger being adapted to hold said lever having said pawl, thereon away from said rack during an upward movement of said plunger.

2. In a stapling machine'a housing member, a driving memberreciprocably mounted in said housing member, a rack mounted upon one of said members, a pawl mounted .upon the other of said members and having a section with two cam faces, a detent having one face engaging one cam face of said pawl to maintainsaid pawl in engagement with the rack when thedriving member is in its uppermost position, said detent having a second face engaging the other cam face of said pawl for holding the pawl out of engagement with said rack upon the driving memb 'er attaining its lowermost position, and a spring vbetween said pawl and detent for maintaining one or the other of said detent faces in engagement with one or the other oi' the cam faces on said pawl. y

3. vIn a stapling machine, a housing member, a driving vmember reciprocably mounted in said housing member, a rack mounted upon one of said members, a pawl mounted upon the other of said members, a dog for maintaining the pawl in engagement with said rack when the driving member is in its uppermost position and during the downward movement-of the driving member,

said dog maintaining saidpawl out of engage- 'aoeaoie 3 ment'with said rack when said driving member `attains its lowermost position. and during the ment with the rack, means for moving the pawl into engagement with the rack when the drivingv member is in its uppermost position, and means for moving the pawl out of engagement with the rack when the driving member is in its lowermost v position.

5-. In a stapling machine, a housing having parallel walls, a driving member reciprocably mounta ed in said housing, a rack upon said driving member and spacing it from said walls, a pawl mounted on said wall in said housing, a detent also mounted on said wall in said housing for maintaining said-pawl in selected positions, one in engagement with said rack and the. other removed from said rack, a stop cn said driving member engageable with lthe pawl to move the. latter into engagement with the rack whenthe driving member is in its uppermost position, an-V other stop on the same member engageable with the pawl to move the latter out of engagement withthe rack when the driving member is in its lowermost position, anda spring .member between said pawl and said detent for maintaining said pawl and said detent in either oi said selected positionsandfor maintaining said pawl against said rack .in said first named position.

6. In a stapling machine, a supporting arm, a

rearwardly opening U-shaped casing secured to Y the front end of the arm and having legs, a

cross plate within the legs of said U-shaped cas-` ing in spaced parallel relation to thevclosed front end thereof whereby a` substantially square plunger guidewayA is provided, and a drivingplunger reciprocably mounted in said guideway. the cross platehaving tongues extending through the material of said plate, andthe material of y the cross plate between said tongues preventing inward displacement .of the legs of said casing.

'7. In a stapling machine, a supporting arm, a driving plunger reciprocablymounted in vsaid arm, a pair of racks carried by the plunger at opposite sides thereof with the'teethin one' rack arranged in staggered relation to the teeth in the other, a pair of pawls carried by the arm for engagement with the racksmeans .on the plunger for moving the pawls into engagement with the teeth ofthe racks when the plunger is in .its

, uppermost positiomand means on the plunger for moving the pawls out of engagement with the teeth on the racks when the plunger is in mounted in said housing, a spring within the plunger to urge it to raised position, a rack mounted between the plunger and housing,` and a pawl movably mounted in the housing to prevent the.I

plunger from returning to its upward position in the` housing until after a complete down-stroke thereof has been made. 9. In a staplingmachine, a housing, a hollow plunger therein, a spring within the plunger, a

rack and a pawl mechanism at the side of the plunger and wholly within the housing to prevent the plunger from returning to its raised position in the housing until after a full down- 5 stroke has been made.

In a stapling machine, a housing, a plunger reciprocably mounted therein, a pawl mounted therein, and a rackfmounted on the plunger and forming one lof the walls thereof and providing housing and cooperating with said bearing plates to provide a full stroke mechanism for said driving member.

12. Ina stapling machine, a U-shaped housing,

a plunger reciprocably mounted in the housing, aspring within the-plunger to urge the plunger into raised position in the housing, a plate mounted on the .plunger for reciprocating movement therewith and bearing upon one of the legs of said housing, and a pawl movably mounted on the same leg in the housing, said pawl and said 3o plate contacting one with another to forma stop for the plunger in its upper position.

13. In a stapling machine, a housing, a plunger reciprocably .mounted therein, a rack plate mounted on the plunger, a p awl movably mounted in the housing'and engaging said rack plate, and a rear bearing plate for the plunger and mounted inthe housing, there being an aperture through the bearing plate for said pawl, said bearing plate cooperating with the pawl and rack plate 4o to form a stop for the plunger in its upward position.

14. In a stapling machine, a housing of U- shape in transverse section, a plunger reciprocably mounted therein, a plat'e mounted on the plpnger at one side thereof and forming a bearing for the plunger against one of the legs of said housing, a spring to urge the plunger into raised position, and a pawl movably mounted on the same leg in the housing, said pawl cooperating with the plate on the plunger to cause the plunger to limit its upward movement.

15. In a stapling machine, a housing, a hollow plunger reciprocably mounted therein, a spring in said plunger to urge the plunger into raised position, a rack plate mounted on the plunger and providing a bearing therefor against the adjacent wall of said housing, and a pawl movably mounted on such wall in thehousing, said rack plate and. said pawl forming a one-way locking-combination for the plunger in its reciprocating movement.

16. In a stapling machine, a housing, a plunger reciprocably' mounted therein, a rack plate mounted on the plunger and forming a bearing forv the plunger, a springto urge the plunger into raised position, a rear bearing plate also forming a bearing for the plunger, there being an aperture therein, and a pawl mounted in the housing,

/said rack plate, rear bearing plateand pawl forming a stop to prevent the'plunger from being ejected from the housing. A

'- i7. In. a stapling machine, a U-shaped 'housing forming a front bearing for a plunger, a hol- Ahavlrplungermounted within the houslnma spring.'

within the plunger to urge it into raised posiaosaors tion, a rack mounted on lthe plunger,l and a pawl mounted within thev housing to prevent the plunger from returning toits upper position until after a full down stroke thereof has been com` pleted. 18. In a stapling machine.I a magazine for staples, a U-shaped front housing forming a bearing for the plunger and attached to the magazine, a hollow plunger reciprocably mounted within the housing, a spring within the plunger to 10 urge it into raised position, a rear bearing plate for theplunger within the U-shaped housing, and rack and pawl means within the U-shaped housing for preventing the plunger frommoving upwardiy until after a complete down stroke there- 15 of has been made, the rear bearing plate having an aperture therein permitting of the pawl engaging the rack.

19. In a stapling machine, av magazine for staples, a U-shaped housing attached tothe front 'n end of the magazine, there being an opening in the other end of said magazine to receive preformed staples, a hollow plunger mounted within the housing and having side walls and a rear wall, a spring within the plunger and of a diam- 25 eter less than the transverse dimension of said side walls to urge said plunger into raised position within the U-shaped housing, a staple follower in said magazine, and a spring for said follower also in said housing. au

20. In a stapling machine, a magazine` for staples comprising a core and side plates, and a closed front U-shaped housing mounted on the front of the magazine, the inside face of the U-shaped housing, the front portion of the inside u faces of the side plates and the end of the core forming an opening through which the staples comprising amember on which the staples rest 5 and a second member for maintaining the staples upon the rst named member, supporting means for the plunger wholly within said housing, and a chute through which the staples are ejected by the driver, the inside faceof the U-shaped hous- 50 ing forming one face of the staple chute.

-22. In a stapling machine, a U-shaped housing, a plunger mounted therein, a magazine for staples comprising a core and side plates having inturned edges, a spring within the plunger to urge the 55 plunger into raised position, anda rear bearing plate for the plunger intermediate the legs of said 4housing and mounted in the housing, there being a forwardly bent portion on the bearing plate resting upon the inturned edges of the side plates, w the forwardly bent portion of the bearing plate acting as anabutment for one end of the spring and also a stop plate for the bottom edge of 'the plunger.

23. In a stapling machine, a housing U-shaped 65. -in transverse section, a plunger mounted therein,

a rack plate mounted on the plunger and parallel to and contacting one of the legs of said housing, a pawl mounted on the same leg in the housing to prevent the return of thefplunger until it has 70 made a full down stroke, and a rear bearing plate mounted within the housing and having an aperture therein to accommcdate'the movements of said pawl.

24, In a stapling machine, a housing, a plunger u mounted therein, a magazine for staples, a follower spring attached to a follower to force staples along said magazine, a follower actuated by said spring, a rear bearing plate for the plunger, and a U-shaped member for holding the follower` spring in spaced relation from the walls of the housing and engaging said bearing plate.

25. In a stapling machine, a housing, a plunger mounted therein and having a rack, a magazine for staples, a rear bearing plate mounted within the housing, parallel ears extending from the bearing plate and in spaced relation to the housing walls, a follower, a follower spring mounted in' termediate said ears, and a pawl movable between one of said ears and said housing wall, said pawl engaging said rack to prevent the plungerfrom returning to its upward position until a full down stroke has been made.

26. In a stapling machine, a base having an anvil, a magazine for staples comprising a member upon which staples ride and a second member for maintaining the staples on said first member, said magazine being movably mounted on the base, a housing of closed U-shaped construe,- tion with legs extending outside of said magazine and mounted at the front of said magazine, a plunger reciprocably mounted in said housing to drive staples along the cross wall of said housing and against said anvil, and support means for said plunger wholly within said housing.

.'27, In a stapling machine, a base, an anvil mounted on the base, a bearing von the base to -piviotally mount a magazine for staples, said magazine having a solid type core and side plates with inturned anges, a U-shaped housing with rearwardly extending legs mounted on the magazine, a hollow plunger reciprocably mounted in the housing, a spring within the plunger', and a @full stroke mechanism comprising a rack and pawl within the housing to prevent the vplunger from returning to its raised position until after a full down stroke has been made.

28. In a stapling machine, a housing having apertures, a plunger reciprocably mounted in said housing, and a fixed bearing plate forming the rear hearing for the plunger and traversing said housingand having tongues mounted in the apertures in said housing.

29. In a stapling machine, a staple carrying arm, a U-shaped housing of relatively light and flexible folded sheet metal having depending parallel walls, a plunger substantially square in vcross section reciprocably mounted therein, and a bearing plate also of sheet metal iixedly secured to the side walls of said housing mounted in the housing intermediate the depending walls to form the rear bearing for the plunger, the walls of said housing being attached directly to said arm and the material of said bearing plate holding the Walls of said housing in predetermined xed spaced relation for the free movement of the plunger. i' l 30. In a stapling machine, a U-shaped housing of folded sheet material, a hollow plunger reciprocably mounted in the housing, a spring within the housing to urge the plunger into raised p'osition, and an upright plate mounted within the housing between the legs thereof to form the rear bearing'for said plunger and having a forwardly extending end acting as a seat for the spring and as a stop for the plunger at its downmost position. Y..

31. In a stapling machine,` a housing having walls, a plunger within the housing, a rear bearing plate for the plunger mounted withinthe housing, a member having parallel ears adjacent to said bearing plate and in spaced relation to the housing walls, a follower spring within said member and intermediate said ears, and a spring pin through said ears and upon which said follower spring is mounted.

32. In a stapling machine, a base having a clinching anvil, a housing of sheet materialpf U-shape in transverse section and having rearwardly extending legs of uniform thickness, a staple magazine which'staples straddle extending from said housing between said legs and pivotally mounted on said base, a plunger reciprocably mounted in' said housing between said legs, and a cover plate secured to said -housing over the open back portion and extending from leg toleg of said U-shaped housing.

33. In a stapling machine, a base, an anvil attached thereto, a magazine for staples, a closed `front U-shaped housing on the 'magazine and having rearwardly extending legs, a plunger reciprocably mounted therein, a spring between the legs of said housing for operating a follower, a

cover plate mounted on the housing at the rear thereof to facilitate insertion and removal of said spring, a follower in said magazine, and a detachably connected nger piece on the follower,

said finger piece arresting said follower at the j staples in said magazine.

35. In a staplingmachine, ai base having a -clinching anvil, a bearing for a staple carrying arm, said arm comprising a core and side plates pivoted to the bearing, spring means tohold the arm in raised position from the anvil, and adjustable means on the arm and spaced from said spring to limit the movement of the arm toward said base.

36. In a stapling machine, a base, an anvil, a staple carrying arm, a bearingion said base for said staple carrying arm, said arm being pivoted to said bearing, a spring on one side of said pivot foryieldably holding said arm in raised position, and adjustable and locking means on the other side of saidpivotto raise or lower the arm in arm operable from the upper side thereof and cooperating with the base to lower or raise the' arm in relation to the anvil.

38. In a stapling machine, a'base having a clinching anvil, a magazine for staples pivotally mounted upon the base, a U-shaped housing on the arm, a plunger reciprocably mounted in said housing and a cover plate with ears secured against the sides of lsaid .U-shaped housing',- said coverclosing the open rear-portion of the ,U- shaped housing and holding the housing walls.y in spaced relation. I

,39. In a stapling machine, a housing having a U -shape, a plunger reciprocably mounted between the legs of the housing, a plate mounted on said plunger between said plunger and one wall of the housing, said plate havinga cut-out portion at its edgeproviding a shoulder, a pawl on said last referred to wall of said housing, and a rack on said plate cooperating with said pawl to prevent said plunger from beingi'moved upwardly until a full down stroke thereof has been made, said pawl engaging said plate to provide a stop for said plunger at its uppermost position.

40. In a stapling machine, a staple carrying arm, a U-shaped housing having a front wall at the end of said arm and side walls parallel to said arm, a plunger at the front of said housing,

i a follower for staples on said arm, a spring for said follower at the rear of said housing, and a partition traversing said housing between said plunger and said follower spring andcomprising bearing means for said plunger and a guide for said follower spring.

, 41. In a stapling machine, a U-shaped housing, a plunger mounted therein, a bearing plate intermediate the legs of said U-shaped.housing, a U-shaped member extending rearwardly of said bearing plate, a magazine for staples, and a follower spring in said U-shaped member and attached to a follower to force staples along said magazine.

42. In a stapling machine. a base having a clinching anvil, a magazine for staples pivoted to said base and comprising a core and side'plates with inturned upper flanges, said plates and flanges providing a guideway for staples in said core, a plunger, a` U-shaped housing for said plunger, comprising sheet material extending to the lower edge of said core and enclosing the front end of said staple vguidevvay, said housing being mountedson said magazine, and means at the front endof said housing `positioned wholly beneath the guideway for staples in said magazine for holding the housing on said magazine.

43. In a stapling machine, a housing, a plunger therein, a spring within-said plungerto urge it into raised position,a magazine for staples, a spring mounted within the housing and having one end connected to a staple follower to move the staples along said magazine, a staple follower,

a partition structure between said plunger and said follower spring, and a rack and a pawl mechanism within the housing and extending through said partition to prevent the plunger from re- -v turning upward until a full driving stroke of said plunger has been made.

44. In a stapling device, a base having an anvil, a staple carrying arm mounted on said base and having a U-shaped housing for a staple driving plunger,a staple driving plunger in said housing, a follower on said arm, a spring mounted within said housing to operate said follower for advancing staples along said arm, a releasable fullstroke mechanism mounted on( said housing and said plunger to insure a full driving stroke of said plunger, and means carried by said plunger for releasing said full stroke mechanism when said plunger has reached its downmost position to allow said plunger to return to its upmost position.

45. In a stapling device, a base having an anvil, a staple carrying arm having a housing, said housing comprising sideplates mounted upon the sides of said arm and a front plate, said front and side plates comprising a U acting as a guide for a staple and for a staple driving plunger, a spring operated follower to advance staples along said arm, a plunger guided by said housing, and

a full stroke mechanism mounted in said housing to insure a full down stroke of said plunger.

46. In a stapling device, a housing, a plunger mounted therein and having a rack, a magazine for staples upon said housing, rear guiding means for said plunger having spaced apart members construction adapted for desk use and having ears projecting upwardly therefrom to mount a zii`v= able staple carrying arm. an arm 0n Said esiti?" separate and unitary U-shaped housing mounted on said arm for guiding a staple driving tool, said arm'having an opening opposite said housing to receive preformed staples in straddle relation, a

plunger in said arm, a spring within said housing for actuating a staple follower, a follower on said arm, a partitioning member between said plunger and follower spring, and a full stroke mechanism carried by said arm and extending through said partitioning member to insure a complete driving stroke of said tool.

48. In a stapling device, a housing comprising la single unitary member having a U-'shape in transverse section, a plunger mounted therein, a rack plate mounted on said plunger, a pawl carried by said housing to prevent the return of said plunger until it has made a full driving stroke, and a rear bearing for said plunger mounted within the housing and having an aperture therein to accommodate the movements of said pawl.

49. In a stapling device, a staple carrying arm, a housing for a reciprocable plunger and having its sides mounted upon the sides of said staple carrying arm, a4 plunger in said arm, said arm having a staple track to receive preformed staples thereon, fastening means between said housing i and arm below the staple track in said arm, and

means carried by said housing and said plunger to insure a full driving stroke of said plunger. 50. A stapling device comprising a base having an anvil, a movable staple carrying arm having a staple track to receive preformed staples in straddle relation,l an independently formed housing for mounting a reciprocal driving plunger, a plunger in said housing. said housing having side plates mounted upon the side plates of saldarm and a-front forming withsaid platesfa U-s'hape,

l a .front portion of said side plates acting as a front guide for the plunger, a spring mounted in said housing for actuating a staple follower, and

mounting means for said housing positioned on said side plates and said arm wholly below said staple track.

51. In a stapling device, a base having an anvil,

.a U-shaped member on said base, a movable staple carrying arm in said, U- shaped member,

said arm having a core forming a staple track, members on. the sides of said track having intumed flanges to guide the staples thereon, a' housing forming a U-shaped member and mount,- ed on the sides of said arm'and externally over'- lapping said track side members, said housing guiding a reciprocable driving tool, a driving'tool in-said housing, spring means to urge said tool to a raised position, a staple follower on said core, and a springmounted on said arm above Cil said core to propel said staple follower to advance staples along said arm.

52. In a stapling device, a housing of 4U-shape, a plunger therein, a magazine having a core forming a staple track, side plates on said core and having inturned llanges to guide the staples on said core, a spring within said plunger to urge it into raised position, and rear guiding means for said plunger within said housing and having a portion forwardly bent to act as an abutment for one end of said plunger spring.

53. In a, stapling device, a housing having walls, a plunger within said housing walls, rear guiding means for said plunger, a guide having spaced apart members contiguous to said rear guiding means and mounted within the housing in spaced relation to said housing walls, a follower spring within said spaced apart members, and a pin through said spaced members upon which said follower spring is mounted.

54. In a stapling device, a base having a clinching anvil, a magazine for staples pivotallv mounted upon said base, a U-shaped housing on said magazine and having legs extending therealong and providing an open rear portion, a plunger movably mounted in said'housing, a cover plate mounted transversely of said housing to close the open rear portion of said housing, and means on said cover plate for holding the housing walls in spaced relation.

55. In a stapling device, a staple carrying arm having a housing, a reciprocable staple driving plunger mounted in said housing, a staple follower, a spring carried by said housing for actuating a staple follower, a plate mounted on said plunger, and a pawl mounted on said housing, said plate and said pawl forming a stop for said plunger in its upward position. 

